
Installation 2
2 - 17
Analog outputs:
Modules should NEVER be installed or removed while power is applied to the
I/O PLEXER.
Note: Analog modules normally run hot to the touch
Both voltage and current output modules provide their own isolated power
output. This eliminates the need for external power supplies and insures electrical
isolation
between each output. This also makes it possible to wire voltage outputs
in series to obtain larger voltage swings (consult application support).
Module status indicators blink briefly when outputs are updated. It should be
noted that the status indicator only reflects the TTL data stream to the modules.
This in of itself does not indicate the actual value of the output signal. Output can
only truly be verified by monitoring the device to be controlled using a
multimeter, oscilloscope, or employing an analog input module as a feedback
tool.
Figure 2-19 Analog Voltage and current output wiring
OI420 analog output modules will drive up to 275 ohms. If the loop resistance
exceeds 275 ohms, and external power supply must be added as shown in figure
2-19. Correct polarity is essential.
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